Why was Washington's presence at the
Convention so crucial?

His presence gave the proceedings legitimacy. It assured the people that if he was on board then the cause was right and just.

Explanation:

His presence gave the proceedings legitimacy. It assured the people that if he was on board then the cause was right and just.

definitely a for sure. ill see and update if i get the answer

increases in demand are shown by a shift to the right in the demand curve. this could be caused by a number of factors, including a rise in income, a rise in the price of a substitute or a fall in the price of a complement.

which the answer is:

b